Combined push-button and thermostat



(No Model.)

F. KEFFER &'J. A. MODOWELL.

GOMBINED PUSH BUTTON AND THERMOSTAT.

No. 359,260. Patented Mar. 15,1887.

FIG#

- UNITED STATES PATENT OFFICE.

FREDERIC KEFFER AND JOHN A. MODOVELL, OF COLUMBUS, OHIO. I

COMBINED PUSH-BUTTON AND THERMOSTAT.

SPECIFICATION forming part of Letters Patent No. 359,260, dated March 15, 1887.

Application filed July 8, 1886. Serial No. 207.514.

To a/ZZ whom it may concern:

Be it known that we, FREDERIC KEFEER and JOHN A. McDowELL, citizens of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented a certain new and useful Improvement in Combined Push-Buttons and Thermostats, of which the following is a specification.

Our invention relates to improvements in the combination of the electric push-button with a thermostat for automatically transmitting alarms and locating fires in buildings; and the objects of our invention are to produce such combination in such manner as to form a simple, neat, and inexpensive device which may be utilized effectively as a push-button or thermostat. These objects we vaccomplish in the manner illustrated in the accompanying drawings, in which- Fgure lis a sectional view of our invention, and Fig. 2 is a plan view of the same.

Similar letters refer to similar parts throughout both views.

b represents a push-button head having a anged base, and being loosely seated in the usual manner within the circular case d.

The button-head is provided with a vertical hole extending through its central portion, the upper portion of said hole being enlarged to form a slightly-conical depression, c, in the upper end of the button-head.

Inserted loosely Within the vertical perforation in the button-head is a pin, e, of such length as to admit of its lower end extending slightly below the bottom flange of the button when its upper end is flush with the base of the depression c. rlhe pin having been inserted within the button until in the posit-ion just described, a melted composition consisting of soft fusible alloys is poured into the depression c, forming, when cool, a stop-bearing for the upper end of the pin, the lower end of which bears against the upper side of a contact-spring, f, near the middle of its length. This contact-spring fis secured in the usual manner at its rear end to the disk g, at which point it receives the electric current from the wire h. Extending from this point aslight distance the upward spring f is then bent for- (No model.)

ward, and, passing beneath the button-head b and pin c, is provided near its outer or free end with an upper contact-point, k, and a lower contact-point, m, said free end being suspended by pressure of the pin c about midway between the corresponding contact-points, n o, fixed, respectively, on the upper and lower sides of contact-arms p and o of the `U-shaped spring s, the arm p being secured to the disk g and connected with the wire t in the usual manner. The spring f is so bent that in case the pressure of the pin e should be withdrawn the natural tension of the spring will cause it to spring upward until the contact-points la and o join.

In case it is desired to use the push-button for signaling purposes, pressure upon the button-head will cause the pin e to extend lower, thus pressing the spring fdownward until its contact-point m is joined with the contactpoint n, thus closing the circuit in the usual manner.

When the/temperature of the air of the apartmentqwithin which the above-described button is placed has reached a sufficient height, the fusible composition will readily melt, allowing the pin c to escape. The contact-point 7c is joined with the contact-point o on the arm r, thus closing the circuit and transmitting the alarm in the usual manner.

By the construction and operation above described it will readily be seen that a simple, cheap, effective device is formed, which may readily be utilized as either a thermostat or electric push-button.

Having now fully described our invention, what we claim, and desire to secure by Letters Patent, is-

In a combined push-button and thermostat, the combination of the button-head b, having the central pin, c, and a depression, c, filled with a fusible composition, with the contact: springs fand s, substantially as and for the purpose specified.

FREDERIC KEFFER. JOHN A. MCDOWELL. Witnesses:

W. S. SHEPHERD, J. P. ALLEN. 

